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Drawing forms contents.

 
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daspamer
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PostPosted: Wed Feb 11, 2015 7:27 pm    Post subject: Drawing forms contents. Reply with quote
I have a form and inside of it a panel with massive width (that has lot's of objects).

I'm trying to copy the 'offscreen' content of the form&panel and draw it into an image (in another form).

I'm not quite sure how the function printToRasterImage works, as it draws for me a black rect (even when using in visible area).

Let's say I have this object

Code:
app = {}
app.init = function()
   local self = app;
   self.form = createForm();
   self.form.width = 600;
   self.form.height = 450;
   self.panel = createPanel(self.form);
   self.panel.width = 1800;
   self.panel.height = 450;
    local lastcol = 0;
    local color = 0;
    local clrs = {0x1186b6,0x2dbdf3,0xefa210,0x9d20dd,0x443dc8,0x2b6905,0x1843eb}
    local mf,mr = math.floor,math.random
   for i=1,25 do
      local obj = createImage(self.panel);
      obj.left = 5 + mf(self.panel.width / 25)*(i-1);
      obj.top = mf(self.panel.height/2);
      obj.Canvas.Brush.Color = (function () while color==lastcol do color = clrs[mr(1,7)] end lastcol = color return color end)();
      obj.Canvas.fillRect(0,0,obj.width,obj.height);
   end
end
app.init();


And I want to draw offscreen (600-1200) do the image object below
Code:
f = createForm();
i = createImage(f);
i.width = f.width;
i.height = f.height;


Without recreating the objects (huge performance impact).
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Dark Byte
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PostPosted: Thu Feb 12, 2015 4:57 am    Post subject: Reply with quote
i'm not sure that's possible, if it's not visible it won't get rendered(painted)

why not use a different design? e. g. create that second form from the start and fill that with the extra controls insteads
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daspamer
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Reputation: 54

Joined: 13 Sep 2011
Posts: 1588
PostPosted: Thu Feb 12, 2015 9:59 am    Post subject: Reply with quote
Dark Byte wrote:
i'm not sure that's possible, if it's not visible it won't get rendered(painted)

why not use a different design? e. g. create that second form from the start and fill that with the extra controls insteads


I'm working on some side fun project.
Thing is, lot's of objects being created which cause heavy performance, so I'm trying to clone part of main window (creating like a preview), which shouldn't use too much resources (as there is no need to mix 4 or images into 1 object and change pixelformat).
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